循环经济下的绿色材料及加工国际论坛 三号通知

Study on linear friction welding of pure copper T2

尊敬的先生/女士：为了促进新材料及其绿色加工技术的前沿学术交流,共同促进新材料、焊接与表面工程技术的发展,定于2017年6月22~24日在北京举行“循环经济下的绿色材料及加工国际论坛”。本次论坛得到了国际焊接学会（ⅡW C-Ⅷ）、中国机械工程学会CMES、中国焊接学会CWS焊接环境健康委员会Ⅷ委、中国焊接学会CWS焊材和焊接冶金委员会Ⅱ委、北京自然科学基金委、北京工业大学、3M公司、

Linear friction welding （LFW） of pure copper T2 was carried out under different friction pressures, and the microstructure and properties of the joints were investigated. The weld zone （WZ） consists of fine grains from recrystallization,and local defects such as swirling flow, non-welded hole and particle inclusions. The microstructure of thermo-mechanically affected zone （TMAZ） is similar to the base metal just experiencing recovery. In addition,the WZ and TMAZ cover a much wider range. The tensile strength of the joints under friction pressures of 50 MPa and 70 MPa are approximately comparable to that of the base metal. The analysis shows that the joint is inclined to form a wide softening zone due to the good plasticity and high thermal conductivity of pure copper during LFW,leading to a poor plastic metal flow and following by defects on the friction interface. A suggestion that heat input rate should be increased during LFW of T2 is given.